As if being pulled by a subtle force.

It is like a hurricane, but trapped in one place by subtle forces.

Critics regard it as far too simple to take into account all the subtle forces at play in real biological or social interactions.

More subtle forces were employed by the Republicans as well.

What subtle forces passed through his skin to evoke whatever had been latent in him?

All the elements whose aid man calls in, will sometimes become his masters, especially those of most subtle force.

His first wife, Oya, embodies more subtle but still powerful forces like the wind.

More subtle forces have been challenging the river, as well.

But there were subtler forces working to the girl's surrender.

There is a subtle, subversive political force at work in China - economic discontent.